32 Operating and installation instructions 0020288151_04
4.7.4 Heat pump as a single unit (hybrid)
With external back-up boiler
A back-up boiler (with eBUS) is connected via the VR 32 (address 2).
A back-up boiler (without eBUS) is connected to the output for the heat pump or the heat pump control module for the ex-
ternal back-up boiler.
System property Basic system diagram
code:
Without
heat ex-
changer
1)
With heat
exchanger
1)
Domestic hot water generation only provided by the back-up boiler without the functional module
– Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
8 10
Domestic hot water generation only provided by the back-up boiler with the functional module
– Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
9 10
Domestic hot water generation through the heat pump and back-up boiler
– Connecting the domestic hot water cylinder temperature sensor to the FM5 functional module
– Without the FM5 functional module, connecting the domestic hot water cylinder temperature sensor
to the heat pump control module and/or heat pump
16 16
Domestic hot water generation provided by the heat pump and back-up boiler with a bivalent domestic
hot water cylinder
– Connecting the upper domestic hot water cylinder temperature sensor to a back-up boiler (separate
charge control)
– Connecting the lower domestic hot water cylinder temperature sensor to the heat pump control
module and/or heat pump
12 13
1) E.g. VWZ MWT
4.7.5 Cascade with heat pumps
Maximum seven heat pumps possible
With external back-up boiler
As of the second heat pump, the heat pumps and, if required, the heat pump control modules, are connected via the VR 32
(B) (address 2 to 7).
A back-up boiler (with eBUS) is connected via the VR 32 (next free address).
A back-up boiler (without eBUS) is connected to the output for the first heat pump or the heat pump control module for the
external back-up boiler.
System property Basic system diagram
code:
Without
heat ex-
changer
1)
With heat
exchanger
1)
Domestic hot water generation provided by the back-up boiler only
– Connecting the domestic hot water cylinder temperature sensor to a back-up boiler (separate charge
control)
9 –
Domestic hot water generation through the heat pump and back-up boiler
– Connecting the domestic hot water cylinder temperature sensor to the FM5 functional module
16 16
1) E.g. VWZ MWT
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